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SWA1801
Active Subwoofer System
1
O F 4 P A G E S
SPEAKER
SWA1801
Features
Active, high-output 18-inch subwoofer system with
4-inch voice coil
High-efciency, high-current 800 watt rms
continuous output amplier
High output 135 dB of peak SPL
Response down to 35Hz (–10 dB point)
Can be used with active or passive speaker systems
Built-in crossover network with stereo or mono high-
pass outputs
Recessed level control, center detent rotating knob
(–15 to +5 dB)
Recessed phase switch (0°–180°)
Compact, portable enclosure
Small footprint allows for unobtrusive, strategic
placement
Baltic birch wood construction, built-in pole mount
Correctly weight-balanced enclosure
Two comfortable side handles for easy carrying and
setup
SWA1801
The SWA1801 is an 18-inch high output, active sub-
woofer system. It features a newly designed high-preci-
sion 18-inch
transducer combined with application-specic
amplier technology. The system is composed of a single,
compact subwoofer cabinet with built-in control and ampli-
er electronics.
The transducer used in the SWA1801 system features a
precision 4-inch voice coil that offers extreme power han-
dling capabilities. The magnetic assembly used features
advancements in coil venting, composite polymide former
construction, and structural cooling that provide lower
temperature rise and substantially improved power com-
pression characteristics.
The amplier found in the SWA1801 cabinet is an
example of application-specic amplier design that can
be
exercised when designing active speaker systems. The
system uses a proprietary high-efciency, high-current
amplier
designed to provide high current levels at all
levels of operation. Having access to high current levels,
no matter what the power output, is absolutely critical
in achieving precise, total control of the woofer mass.
This control is responsible for lowering audible distor-
tion artifacts and providing aggressive attack through the
operating band pass of the system. The amplier, which is
mounted on a large, nned aluminum heat sink, is rated at
800 watts rms continuous output.
The SWA1801 features a sophisticated on board con-
trol system, allowing for exible integration with active or
passive full range or mid/high speaker systems. The input
panel accepts a line-level input signal and has LOOP OUT
connectors for signal routing to other devices. It also has
HIGH PASS out connectors for connection to active full range
speakers or ampliers powering passive full range speakers.
All signal routing is through XLR connectors in L+R stereo
or mono. There is a phase selection switch and a recessed
level control. The system features thermal protection for
the power supply and amplier and also incorporates rms
limiting protection for the amplier stage that limits the
amount of long term power delivered to the transducer.
The cabinet is constructed using 18 mm thick multi-
layered birch plywood and nished in black splatter paint.
There is one handle on each side for efcient loading and
transport as well as a top, female pole mount xture.
R E L A T E D P R O D U C T S
SRM350/SRM450/SR1530/SA1521/SA1232 Active Loud-
speakers, SWA1501
Active Subwoofer, 1202-VLZ PRO
12-Channel Mic/Line
Mixer, 1402-VLZ PRO 14-Channel
Mic/Line Mixer, 1604-VLZ
PRO and 1642-VLZ PRO 16-
Channel Mic/Line Mixers.
Applications
Live Sound/Music Reinforcement
High-Level AV Playback
Small to Medium-Sized Portable PA Systems
Corporate Events
Night Clubs
Houses of Worship